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📦 Box Breathing (4-4-4-4): The Navy SEAL Breathing Technique

4 min read · Breathing Techniques

What is box breathing?

Box breathing (four-phase breathing) is a simple technique with four equally long steps: inhale 4 seconds, hold 4 seconds, exhale 4 seconds, hold 4 seconds — drawn like a square ("box"). The technique is used in military stress-management training, for instance to calm units like the US Navy SEALs before demanding operations.

What does the research say?

A systematic review (Zaccaro et al., 2018, Frontiers in Human Neuroscience) examined 15 studies on slow breathing: slow breaths measurably increase parasympathetic (rest-and-digest) activity, assessed via heart rate variability (HRV) and respiratory sinus arrhythmia. Participants additionally reported less anxiety, tension and anger, and greater wellbeing.

Instructions (4 minutes)

1) Sit upright, feet on the floor. 2) Inhale calmly through the nose for 4 seconds. 3) Hold gently for 4 seconds (don't tense up). 4) Exhale through the mouth for 4 seconds. 5) Hold for 4 seconds. That is one "box" — repeat 4–6 boxes in a row. The breath pacemaker in the Spirit6 dashboard guides you visually through exactly this pattern.